Thanks to John Marino’s work, it’s now possible to build the DragonFly kernel and world using gold, and have it work. You just have to set WORLD_LDVER to make it work. I don’t think there’s any user-visible change from this, other than a tiny speedup in building. I don’t know if any other BSD is using gold yet.
A running description of activity related to DragonFly BSD.
Few weeks ago first commits related to writing linker (ld) in Elftoolchain project showed up. I guess sooner or later there will be functional BSD-licensed linker on the market.